Which thermodynamic consequence occurs inside bird lungs when air flows unidirectionally across parabronchi?

💡 Explanation

When air flows unidirectionally and blood flows perpendicularly resulting in countercurrent exchange in bird lungs, a concentration gradient is maintained because depleted blood encounters partially depleted air improving gas exchange efficiency. Therefore extracting much more oxygen results, rather than decreased water evaporation, reduced susceptibility to air sac rupture or minimized respiration heat exchange both of these mechanisms require vastly different processes.

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